We now know we can narrow down whoever's #underthesheet on How to Get Away With Murder to someone with a Y chromosome.

With the reveal at the end of tonight's new episode that Michaela (Aja Naomi King) is alive and well and at home with her white mom (!!) Trishelle (hey, Brett Butler!) on Night X, all the ladies of HTGAWM are alive and accounted for. Well, some more so than others. (We're looking at you, unconscious and somehow pregnant Laurel.) That, of course, leaves a handful of our favorite men still in harms way. Will we be saying goodbye to Wes, Connor, Asher, Frank, or Nate?

Whoever it may be, star Liza Weil wants you to know that, if you're anything like her, there is nothing but heartbreak is coming your way when all is revealed.

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"I don't know if there are words to describe how deeply we are feeling the loss of that person," she told E! News when asked how the cast took the news themselves. "It was a huge surprise and it's really devastating. I think that it's going to certainly rock these characters to their core, but also us as cast members and people. It's a pretty profound loss, and I have to remind myself every day that this person isn't actually dead. It's really upsetting."

Of course, before we can even get to that major reveal, there are a few more pressing matters at hand. Namely, the fallout from Bonnie's decision to find Frank (Charlie Weber) in Coalport (where he just killed her father), not tell Annalise (Viola Davis) about it, and then sleep with him. After all, with Laurel (Karla Souza) physically incapable of keeping a secret, Bonnie's got some 'splaining to do. Fast.

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"Next week, we will see Annalise's reaction to Bonnie seeing Frank in Coalport—and how Bonnie is going to spin that. I think that there's a part of all these people, especially with Annalise, Bonnie, and Frank—it's just sort of the way that they're built. They're always expecting betrayal at some point. I don't think that they ever really feel that they deserve real relationships, so I don't think Bonnie is entirely surprised at Laurel coming clean with Annalise," Weil teased. "I think Laurel has proven that she can't help herself, that she has this compulsion to do what she thinks is right. But Bonnie is no fool and I think that she is very aware that by her going to Coalport, there could be a serious fallout to that. I think it will be surprising for viewers to see what she has in store."

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Whatever surprise is in store, it'll be hard to top the shocker that was Bonnie and Frank getting physical after whispering their fantasy about running away together somewhere far away from Annalise and all this murder. The hookup was a game-changing moment for the characters, but for the actors playing them, the sex felt like a natural progression. "I think that it was something that made a lot of sense to us. I think that these people are very connected," Weil admitted. "I think that this show has so much going on—all of these characters have been through so much and are operating from a very compromised state. I think that, you know, there is a very primal need to connect and I think that they can do that for each other. I think that, unfortunately, boundaries can get very blurry with these characters."

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Don't expect Bonnie to recover so quickly after being abandoned by Frank yet again by episode's end, either. "Moving forward, I think it will be interesting to see how Bonnie is going to be able to deal with being left there," she added. "I think that Frank provided a safe, warm place and then just pulled the rug out from under her. I think that's a deep, cutting move."

If he hadn't ran without her, though, would Bonnie have followed through on the fantasy to run? Weil admitted that even she needed some clarification before playing the scene. "I actually remember pulling our writer aside that day because right before we were about to film it, it occurred to me, 'Oh, s--t. Does she really think that they're about to…get in the car and go to Oregon?' she revealed. "And he was like, 'No, no!'"

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The prospect of running away together still remains, but the primary objective for Frank and Bonnie is to get him back under Annalise's wing. If only he would stop making it so damn hard. "I think they need to do that first. But now Frank has made that difficult as well. He doesn't do anything the easy way," Weil said, laughing.

If it's not Frank #underthesheet on Night X, could he be the one on the other end of Bonnie's mysterious phone call in the hospital, the person she asks to trust her—and the one she informs of Laurel's pregnancy? Obviously, Weil isn't saying, but she did tease that whoever it is should come as—you guessed it—quite the surprise.

"I think it's pretty surprising. Again, when we shoot those pieces, I didn't know who I was speaking to. I've just figured that out," she said. "I think it is very surprising, especially given some things that are set up, story-wise, in upcoming episodes. I think Night X, especially this season, is just going to be a complete game-changer."

Who do you think is #underthesheet? Drop your theories in the comments below.